“She’s a nice girl,” said Tom after a moment. “They oughtn’t to let her run around the country this way.”

Tom doesn’t like the idea of women just running from partner to partner, he claims the “traditional” family is much more proper. This is the old money in him speaking. Which is very ironic and hypocritical since he is cheating on his wife for a married woman.

And Daisy doesn’t take too kindly to this comment. Trouble in paradise.